What's the best approach in this case?

Discussion in 'Mac Programming' started by xelhark, Jun 25, 2013.

  1. macrumors newbie

    Jul 16, 2010
    I am creating a small app, I'm using it mainly to learn how to properly program in Objective-C and cocoa.

    So, there's this Outline view which displays a tree hierarchical structure of data, and a collection view of other items. The leaf items from the outline view should be associated by the user to the items in the collection view, so there is a button to do that.

    This button should only be clicked when I have a single leaf object selected and a single item selected in the collection view.

    So I made two properties
    @property (readonly) Media *selectedMedia;
    @property (readonly) MediaInfo *selectedInfo;
    //---- .m
    - (Media*) selectedMedia{
        return [mediaOutlineView itemAtRow:[mediaOutlineView selectedRow]];
    - (MediaInfo*) selectedInfo{
        if([searchResultController.selectedObjects count] == 1){
            return [searchResultController.selectedObjects objectAtIndex:0];
        return nil;
    And a third boolean property:
    @property (readonly) BOOL canAssociate;
    //--------- .m
    - (BOOL) canAssociate{
        return ([self selectedMedia] && [self selectedInfo]);
    I used cocoa bindings to enable the button to the 'canAssociate' response, but this should change whenever the user clicks on a leaf node on the outline view or clicks on the collection view.

    How do I do that? What's the best approach to do this kind of things? Is this good enough?

    Thanks for your time

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